Cutting attachment for sewing-machines.



R. R. HUGHES. In. CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED OCT l2. l9l4-- Patented, Jim.- 28, 1919/ 2SHEETS-SHEETI attom qx R. R. HUGHESI JR.

CUTTING- ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED OCT. 12. 1914.

1 ,292,784. Patented Jan. .28, 1919.

2 SHEETSSHEET 2.

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ROBERT E. HUGHES, JR., OF NEW YORK, N. Y., ASSIGNOR T0 "UNION SPECIALMACHINE COMPQNY, OF CHICAGO, ILLINOIS, A COBPORATWN CF ILLINOIS.

CUTTING ATTACHMENT FOR SEWING-MACHINES.

Specification of Letters Patent. Patentgd Jan, 28, 1919,

Application filed October 12, 1914. Serial No. 866,314.

To all whom it may concern.-

Be it known that I, ROBERT R. HUGHES, Jr., a citizen of theUnitedStates, residing at New York city, in the county of New York, State ofNew York, have invented The object of theinvention is to provide adevice which can be operated automatically by the reciprocation of thepresser bar under the action of the feed dog or under the action of thefoot lifting lever; or may be operated by some other moving part of themachine; or by the movement of the thread or stripitself inserted in thejaws of the attachment and drawn upon by the operative. 'Thus it will beseen that the device may operate either while the machine is inoperation or at rest.

The invention has been especially designed for use in connection withthe well lmown Union Special overseaming machine, and especially to amachine of that character having a trimmer and binder applied, such asillustrated in the applications filed in the name of James R. Moifatt,June 7th, 1912, Serial Numbers 702,242 and 702,243, but I do not wish tobe limited to such application.

The invention consists in the various matters hereinafter described andreferred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which-Figure 1 is an endview of a sewing machine of the above type, showing myinvention applied thereto;

Fig. 2 is a front view in cross section of the cutting device;

Fig. 3 is a view similar to Fig. 1, illustrating a modified way ofattaching one of the shear blades;

Figs. 4 and 5 are detailed views of the cutting device and supportingbracket, from op osite sides;

ig. 6 is a detail view of the cutting device and supporting bracket,showing in full lines the normal position of the parts and in dottedlines the position of the parts when raised by the feed dog; and

Fig. 7 is a similar view showing the position of the parts when raisedby the presser foot lever, the lever being given its maximum swlng.

In these drawings, 1 represents the bed plate of a sewing machine of thetype above referred to, 2 the standard,'3 the needle bar, 4 the needle,5 the feed dog, 6 the prcsser foot, 7 the presser bar, 8 the secondaryresser bar which is connected to and moves in unison with the presserbar 7, 9 the work support and 10 the presser foot lifting lever. Themovable trimming blade of the ma chine is shown at 11, and is clamped byretaining clamp and screw 12 and 12 to the supporting arm 13, which isclamped to the trimmer shaft 14 supported at the front end in bearings16 on bracket 17 by clamp screws 18. An arm 22 operated from the mainshaft oscillates the arm 13. An oil guard 23 beneath the bearing 16catches the oil dripping therefrom. I

The numeral 24 represents a block which is clamped by suitable screws tothe secondary presser bar. To this block is attached, as herein shown,by two screws 25, a bracket 26 extending downwardly to a point in rearof the presser foot'and having pivotally secured to it, by a screw 27, acurved arm 28 carrying at its lower end a shearing blade 29 and havingat its upper end a spring connection 30 with the bracket 26. At thelower end of the bracket 26 is secured a pin 31 which passes through anelongated horizontal slot 32 in the shearing blade arm 28, and at itsinner end passes into an open ended vertical slot 33 in the upper orsecondary shearing blade 34, which is pivoted to the main shearin bladeat 35. The outer end of this secon ary shearing blade 34 preferablyrests against the lower side of the shaft bracket oil guard 23, althoughit may bear directly against the shaft if a guard is not employed; andwhen the presser bar is moved up and down by the action of the feed doand presser bar spring, or is moved up an down by the foot lifter 10 andthe springs, the outer end of the arm of the maln shearing blade 34which rests against the oil guard 23 will not only'swing the arm up onits fulcrum or pivot 35, but will on the upward movement of the presserbar, through the pin and slot connection 31 and 33, give a movement tothe main shearing blade 29, thus giving .a joint shearing action to thetwo blades. The elongated slot 32 also acts as a stop for the pin andthe spring tends to restore the parts to normal position; that is, withthe shearing blades open ready for the shearing action when manipulated37 the upward movement of the presser By referring to Fig. 6, it will benoted. that the free end of the upper blade 34 is normally disposedunder and bearsagainst the oil cup] 23, and when the feed is raised theupper ade 34 is rocked'upwardly on its fulcrum, the fulcrum being at thefree end of the blade. At the same time the lower blade 29 is movedupwardly and forwardly to a slight extent. Further it will be noted thatthis attachment is wholly disposed above and in spaced relation to thecloth plate, and it maintains this relation at all times, thus creatinga free passage for the body fabric; the upward movement of the feed dogimparts to both jaws a shearing action of a length less than the upwardmovement of the feed dog; the mouth ofthe attachment extends rearwardlyand, furthermore, the jaws are so arranged as to provide a normal openmouth for receiving the material to be severed/ This is true 1 when themachine is idle and'when the feed is in any position, and, therefore,under the normal operation of the machine the mouth of the attachment isalways open to receive such material.

As shown in Fig. 7, when the foot lever is depressed to its maximum themouth of the jaws is closed. Thus it will be seen that in the ordinaryoperation of the machine the mouth of the cutter is always open whetherthe feed dog is up or down, but when raised by the foot lever the jawsare closed. The advantage of this is that when the presser foot israised by the action of the foot lever,

and therefore, the goods are not clamped upon the cloth plate, theoperator can not insert the tape intothe jaws of the cutting attachmentand perform the cutting action.

It will be noticed that, by reason of the connection between the bracketand the shearing blade arm and the secondary shearmg blade and. the mainshearing blade on sald shearing blade rm, the shearing action titl maytake place when the machine is at rest and there is no movement of thepresserbar; by the operative drawing the material to be severed into thejaws, the action in such case i being that the material to be severeddraws against the lower or main shearing blade,

- swings that on its pivot againstthe tension of the spring 30 andthrough the pin and slot connection 31-33 will cause the upper eas es orsecondary shearing blade to swing downward and perform the cuttingaction.

In Fig. 3, a modification of-the invention is shown, in which, insteadof the upper end of the secondary shearing blade coming into contact inthe movement of the presser foot against the oil guard or otherprojection on the machine, it is pivoted to the lower end of a link 36,which atits upper end is pivoted as at .37 to the stationary part of themachine and in the upward movement of the presser bar this link 36 willforce down the secondary shearing blade in the same manner as describedin connection with the oil guard 23, shown in Fig. 1, and the actionwhen the machine is not in operation is precisely the same as describedin connection with the other figures.

Having thusfully described my invention,

what I claim as new and desire to secure by Letters Patent, is

l. The combination with a sewing machine having a work support, of acutting attachment comprising cutting jaws disposed wholly above and inspaced relation at all times to the work support, means open ated by amovable part of thev sewing machine for actuating one of said jaws, anddevices iorconnecting the jaws whereby the movement of said jaws by thesewing machine imparts a shearing action to the other aw.

chine including a feed dog having forward and backward and upward anddownward movements, and presser toot of a cuttin attachment comprisingshearing jaws, an means operated by the upward movement of thefeed dogfor imparting to both jaws a shearing action of 'a length less than theupward movement of the feed dog.

3. The combination with a sewing machine including a feed dog havinforward and backward and upward and .ownward movements, and presserfoot, of a cutting attachment comprising shearing jaws, means operatedby the upward movement of the feed dog for imparting to both jaws ashearing action oi? a length less than the upward pivot to close againstthe other jaw.

. 5. A cutting attachment for sewing machines, comprising a bar havingon its lower end a cutting jaw, and adapted to be secured 2. Thecombination with a sewing ma- 1 to a moving part of the machine, saidcutting jaw being pivoted to said moving part of the machine andnormally spring pressed in one position, a cooperat ng cutting jawadapted in the upward bodily movement of the first cutting jaw to beswung on its pivot to cooperate with said first cutting jaw to sever thematerial between the jaws.

6. A cutting attachment for sewing machines, comprising a bar having onits lower end a cutting jaw, and secured to a moving part of themachine, said cutting jaw being pivoted to said moving part of themachine and normally spring pressed in one position, a cooperatingcutting jaw adapted in the upward bodily movement of the first cuttingjaw to be-swung on its pivot to cooperate with said first cutting jaw tosever the material between the jaws, and pivoted at its opposite end toa bar which is pivoted at its upper end to a stationary part of themachine frame.

7. A cutting attachment for sewing machines, comprising a bar having onits lower end a cutting jaw, and secured to the presser bar, saidcutting jaw being pivoted to said bar and normally spring pressed in oneposition, a cooperating cutting jaw adapted in the upward bodilymovement of the first cutting jaw to be swung on its ivot to cooperatewith said firstcutting jaw to sever the material between the aws, and apin carried by the part to which the first jaw is pivoted passingthrough a slot in the said jaw and securedto the second jaw.

8. A cutting attachment for sewing machines comprising a pivoted jaw, asecond jaw pivoted to the first-named jaw, means whereby the first-namedjaw is swung on its pivot through the action of a movable part of thesewing machine, and devices for caus ing the second-named jaw to begiven a shearing movement through the movements of the first-named jaw.

9. A cutting attachment for sewing machines comprisinga pivoted jaw, aspring for moving said jaw in one direction about the ivot, a'second jawpivoted to the first named jaw, and means cooperating with the secondjaw for causing the jaws to be moved toward each other to sever thematerial placed between the same when the firstnamed jaw is moved aboutits pivotal support and in a direction opposite to the direction of themovement thereof by the spring.

10. A cutting attachment for sewing machines, comprising a bar adaptedto be secured to a moving part of the machine, a main shear bladefulcrumed thereon, a second shear blade fulcrumed to the first shearblade and engaging a pin on the first shear blade shank, and an abutmentwith which the second shear blade contacts in the movement of themachine to cause cooperation of the shear blades.

11. A cutting device for sewing machines comprising a bar adapted to besecured to a moving part of the machine and including two shearingblades, one fulcrumed to said bar, and the other fulcrumed to the firstshearing blade, and connections between the two, whereby the swinging ofone or the other on its fulcrum will operate the other to causecooperative closing action.

12. A cutting device for sewing machines comprising a bar adapted to besecured to a moving part ofthe machine and including two normally openshearing jaws, one fulcrumed to said bar and the other fulcrumed to thefirst, and pin and slot connections between the two, whereby theswinging of one or the other on its fulcrum will operate the other tocause cooperative closing action of the jaws.

In testimony whereof, I aifix my signature, in the presence of twowitnesses.

ROBERT R. HUGHES, JR.

Witnesses:

RANDOLPH S. OswALD, LANSING ONDERDONK.

